Crosslinking with GL-xxx not working

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I have a commit like in the picture with the text “GL-2” in it. It should link to issue #2 but it doesn’t. This is happening on a (i think) open source onprem installation. Is this a configurable feature, so I can tell the admin which switch he has to toggle?

I tried the same thing on gitlab.com, there it works.

Seems to be a pretty new feature, they updated the instance and now it works.